Help-What is wrong with my camera/lens???

Discussion in 'Digital Discussion & Q&A' started by alibongo, Nov 7, 2009.

  1. alibongo

    alibongo TPF Noob!

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    I recently bought a used 28-135 IS lens for my canon 20d. I took it out tonight to get some nighttime hdr shots, when I got home this is what I found..
    [​IMG]

    What could cause the black strip at the top of the photo? Also, the pic looks to be really low quality, it was shot at iso 100 on a tripod with a remote..In addition, if you look at the scale to the left of the picture it looks like there is alot of static involved with the image..

    Here is another one, instead of the black at the top, there are greenish black strips on the sides, if you go to my imageshack page and zoom in on the picture you will see that there is the same type of static as the first on the scale. Again, iso 100 shot on a tripod with remote..

    [​IMG]



    The previous photos I have taken with this camera on several different lenses have all been okay. Even nighttime hdr using photomatix, they have all been sharp and clear.

    What could be the problem?


    Thanks in advance for your help...

    Alex
     
  2. Garbz

    Garbz No longer a newbie, moving up!

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    Post some non-tone mapped shots please. The quality of an image is very hard to judge due to HDR processes. Even with the finest gear some HDRs are just horrid due to the software not matching the tone or aligning the images correctly.

    As for the green stripe, again is it there in non-HDR images? Photomatix can introduce artefacts and things like that quite easily, though I haven't ever seen it appear quite as consistently as that.
     
  3. alibongo

    alibongo TPF Noob!

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    Sure, the hdr seems to show the problem better, but in the pics below check out the left side and right sides, the left seems to be worse than the right.. It is in all pics with long exposures but seems to be fine with any daytime pictures..

    [​IMG]



    [​IMG]
     
  4. Garbz

    Garbz No longer a newbie, moving up!

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    The HDR masked the fact that the stripe went vertically over the entire frame. On the HDR I thought it was flare or something, but I'm afraid to say it looks like a camera problem.

    The quality of the image is fine by any standard, so I think HDR would have caused any concerns you have there. Even at ISO100, HDR pushes a lot of brightness out of dark areas creating very crap image quality. I have only managed to do one somewhat decent night-time HDR, and I have seen few examples of it working well too.

    But the stripe, it's consistency to the edge of the frame, and the fact that it appears over both exposed and black areas is really not good :( I don't like saying it but give Canon support a call.
     
  5. ruaslacker2

    ruaslacker2 TPF Noob!

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    Did you remember to turn off the IS while shooting from a tripod ? It will still try to compensate causing focus problems.
     
  6. alibongo

    alibongo TPF Noob!

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    Yes, the IS was off in all pictures. Garbz, so you think it may be a camera problem not a lens problem? I will have to try out another lens but it seems like I never had this problem before shooting night shots with any other lens.
     
  7. Garbz

    Garbz No longer a newbie, moving up!

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    For the simple fact that lenses are round, and bend light into all sorts of angles, I think because of the very perfect consistency of those green lines it's a camera problem.

    Definitely try and narrow it down first with another lens though.
     
  8. Flash Harry

    Flash Harry TPF Noob!

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    Looks a bit like when you shoot at a higher SS than sync speed when using flash, I think you may have a slight problem with a sticky shutter curtain. H
     
  9. UUilliam

    UUilliam TPF Noob!

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    looks like you have a lens hood on?
    maybe catching vignette off that?
     
  10. Tiberius47

    Tiberius47 TPF Noob!

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    Take a picture of a uniform surface, such as a wall so we can see more clearly what the problem is please?
     
  11. Garbz

    Garbz No longer a newbie, moving up!

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    If you're going to do that, also take a very long exposure with the lens cap on. From the looks of things the green effect comes up regardless if light is hitting the sensor or not. Try giving us a 5-10min exposure, or a shorter exposure at higher ISO.

    Flash sync would only happen if there was something to actually illuminate with the flash.
    I have never seen vignetting perfectly square across the top of a frame.
     
  12. alibongo

    alibongo TPF Noob!

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    Alright, sorry for the delay, here is a 5 min exp with the cap on manual focus, IS turned off at ISO 400. The camera wasn't perfectly still but didn't think that would matter:

    [​IMG]
    By alexchallinor, shot with Canon EOS 20D at 2009-11-10


    Does anyone know what the thing is in the bottom left corner? Also, are the tiny spots dead pixels?!?! It's strange how the green is now focused in the center and not the sides..



    Thanks again for the help!
     

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